This episode introduces Trace of Suspicion, a new Dateline podcast series hosted by Josh Mankiewicz. The featured case involves a young Marine who died unexpectedly, leaving behind a widow whose behavior after his death raised eyebrows in their San Diego community. The Marine was described as religious and conventional, while his wife was a free-spirited person who identified as a hippie and Grateful Dead fan. After the Marine's military funeral, his widow began hosting parties and spending his insurance money on luxury items including breast implants and jewelry. Neighbors criticized how quickly she seemed to move on from her husband's death. The investigation began largely due to community gossip about the widow's new lifestyle and appearance changes. Chemists eventually found arsenic in the Marine's body, leading to murder charges against his wife. The case reveals concerning issues with the investigation and prosecution, with sources suggesting investigators became fixated on a theory without proper evidence. The widow's family spent over a million dollars defending her, including selling their house and cashing in retirement savings. Critics argue the case represents prosecutorial misconduct, with the justice system treating the matter like a game rather than a serious pursuit of truth. The podcast examines how social judgments about appropriate widow behavior influenced a criminal investigation. It questions whether the case would have proceeded if the widow had made different cosmetic choices. The series promises to explore cases where the wheels of justice go off the rails. Subscribers to Dateline Premium can access episodes early and ad-free, while free episodes begin March 10th. The preview suggests this will be a deep dive into prosecutorial overreach and flawed investigations.